The invention discloses a water and electricity integrated intelligent diesel heating device, facility and system and a working method thereof, and belongs to the field of automobiles. The water and electricity integrated intelligent diesel heating device comprises an engine, a main oil tank, an auxiliary oil tank, an engine water inlet/outlet, an oil pump, an oil return regulating tee joint, an oil absorbing regulating tee joint, a filter, a regulating valve, a water circulation heating pipeline, a water and electricity oil quantity sensor, an electric oil tank heater and an integrated oil quantity sensor. The main oil tank and the auxiliary oil tank are communicated with the engine through a heating oil supply pipeline, the engine water inlet/outlet is communicated with the main oil tank through a circulation water pipeline, the oil pump, the oil return regulating tee joint, the oil absorbing regulating tee joint and the filter are sequentially arranged on the heating oil supply pipeline, the regulating valve is arranged on the circulation water pipeline, the water circulation heating pipeline is arranged inside the main oil tank, the water and electricity oil quantity sensor and the electric oil tank heater are arranged on the end portion of the water circulation heating pipeline and the integrated oil quantity sensor is arranged on the end portion of the auxiliary oil tank. The water and electricity integrated intelligent diesel heating device, facility and system are low in cost and obvious in heating effect and meanwhile, solves the problem of potential safety hazards existing in existing products.